<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{
				padding: 0;
				margin: 0;
			}
			div{
				position: absolute;
			}
			.outer{
				width: 150px;
				height: 300px;
				/*background-color: pink;*/
				top: 50%;
				left: 50%;
				margin-left: -75px;
				margin-top: -150px;
			}
			.div1{
				width: 100%;
				height: 30px;
				background-color: #000;
				top: 20%;
			}
			.div2{
				width: 30px;
				height: 100%;
				background-color: #000;
				left: 50%;
				margin-left: -15px;
			}
			div span{
				border-width: 15px;
				border-style: solid;
				position: absolute;
			}
			.span1{
				border-color: transparent #000 transparent transparent; 
				left: -30px;
				top: 0;
			}
			.span2{
				border-color: transparent transparent transparent #000; 
				right: -30px;
				top: 0;
			}
			.span3{
				border-color: transparent transparent #000 transparent; 
				right: 0px;
				top: -30px;
			}
			.span4{
				border-color: #000 transparent transparent transparent; 
				right: 0px;
				top: 300px;
			}
		</style>
	</head>
	<body>
		
		<div class="outer">
			<div class="div1">
				<span class="span1"></span>
				<span class="span2"></span>
			</div>
			<div class="div2">
				<span class="span3"></span>
				<span class="span4"></span>
			</div>
		</div>
		
	</body>
</html>
